June 2021 - Linuxarm - mailweb.openeuler.org

[PATCH v2] PCI/DPC: Check host->native_dpc before enable dpc service
by Yicong Yang 28 Jul '21

28 Jul '21

Per Downstream Port Containment Related Enhancements ECN[1] Table 4-6, Interpretation of _OSC Control Field Returned Value, for bit 7 of _OSC control return value: "Firmware sets this bit to 1 to grant the OS control over PCI Express Downstream Port Containment configuration." "If control of this feature was requested and denied, or was not requested, the firmware returns this bit set to 0." We store bit 7 of _OSC control return value in host->native_dpc, check it before enable the dpc service as the firmware may not grant the control. [1] Downstream Port Containment Related Enhancements ECN, Jan 28, 2019, affecting PCI Firmware Specification, Rev. 3.2 https://members.pcisig.com/wg/PCI-SIG/document/12888 Signed-off-by: Yicong Yang <yangyicong(a)hisilicon.com> --- Change since v1: - use correct reference for _OSC control return value drivers/pci/pcie/portdrv_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c index e1fed664..7445d03 100644 --- a/drivers/pci/pcie/portdrv_core.c +++ b/drivers/pci/pcie/portdrv_core.c @@ -253,7 +253,8 @@ static int get_port_device_capability(struct pci_dev *dev) */ if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) && pci_aer_available() && - (pcie_ports_dpc_native || (services & PCIE_PORT_SERVICE_AER))) + (pcie_ports_dpc_native || + ((services & PCIE_PORT_SERVICE_AER) && host->native_dpc))) services |= PCIE_PORT_SERVICE_DPC; if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM || -- 2.8.1

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[RFC PATCH 0/5] KVM/ARM64 Add support for pinned VMIDs
by Shameer Kolothum 23 Jul '21

23 Jul '21

On an ARM64 system with a SMMUv3 implementation that fully supports Broadcast TLB Maintenance(BTM) feature as part of the Distributed Virtual Memory(DVM) protocol, the CPU TLB invalidate instructions are received by SMMUv3. This is very useful when the SMMUv3 shares the page tables with the CPU(eg: Guest SVA use case). For this to work, the SMMU must use the same VMID that is allocated by KVM to configure the stage 2 translations. At present KVM VMID allocations are recycled on rollover and may change as a result. This will create issues if we have to share the KVM VMID with SMMU. Please see the discussion here, https://lore.kernel.org/linux-iommu/20200522101755.GA3453945@myrica/ This series proposes a way to share the VMID between KVM and IOMMU driver by, 1. Splitting the KVM VMID space into two equal halves based on the command line option "kvm-arm.pinned_vmid_enable". 2. First half of the VMID space follows the normal recycle on rollover policy. 3. Second half of the VMID space doesn't roll over and is used to allocate pinned VMIDs. 4. Provides helper function to retrieve the KVM instance associated with a device(if it is part of a vfio group). 5. Introduces generic interfaces to get/put pinned KVM VMIDs. Open Items: 1. I couldn't figure out a way to determine whether a platform actually fully supports DVM/BTM or not. Not sure we can take a call based on SMMUv3 BTM feature bit alone. Probably we can get it from firmware via IORT? 2. The current splitting of VMID space is only one way to do this and probably not the best. Maybe we can follow the pinned ASID method used in SVA code. Suggestions welcome here. 3. The detach_pasid_table() interface is not very clear to me as the current Qemu prototype is not using that. This requires fixing from my side. This is based on Jean-Philippe's SVA series[1] and Eric's SMMUv3 dual-stage support series[2]. The branch with the whole vSVA + BTM solution is here, https://github.com/hisilicon/kernel-dev/tree/5.10-rc4-2stage-v13-vsva-btm-r… This is lightly tested on a HiSilicon D06 platform with uacce/zip dev test tool, ./zip_sva_per -k tlb Thanks, Shameer 1. https://github.com/Linaro/linux-kernel-uadk/commits/uacce-devel-5.10 2. https://lore.kernel.org/linux-iommu/20201118112151.25412-1-eric.auger@redha… Shameer Kolothum (5): vfio: Add a helper to retrieve kvm instance from a dev KVM: Add generic infrastructure to support pinned VMIDs KVM: ARM64: Add support for pinned VMIDs iommu/arm-smmu-v3: Use pinned VMID for NESTED stage with BTM KVM: arm64: Make sure pinned vmid is released on VM exit arch/arm64/include/asm/kvm_host.h | 2 + arch/arm64/kvm/Kconfig | 1 + arch/arm64/kvm/arm.c | 116 +++++++++++++++++++- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 49 ++++++++- drivers/vfio/vfio.c | 12 ++ include/linux/kvm_host.h | 17 +++ include/linux/vfio.h | 1 + virt/kvm/Kconfig | 2 + virt/kvm/kvm_main.c | 25 +++++ 9 files changed, 220 insertions(+), 5 deletions(-) -- 2.17.1

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[PATCH net-next RFC 0/2] add elevated refcnt support for page pool
by Yunsheng Lin 10 Jul '21

10 Jul '21

This patchset adds elevated refcnt support for page pool and enable skb's page frag recycling based on page pool in hns3 drvier. Yunsheng Lin (2): page_pool: add page recycling support based on elevated refcnt net: hns3: support skb's frag page recycling based on page pool drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 79 +++++++- drivers/net/ethernet/hisilicon/hns3/hns3_enet.h | 3 + drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c | 1 + drivers/net/ethernet/marvell/mvneta.c | 6 +- drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 2 +- include/linux/mm_types.h | 2 +- include/linux/skbuff.h | 4 +- include/net/page_pool.h | 30 ++- net/core/page_pool.c | 215 +++++++++++++++++---- 9 files changed, 285 insertions(+), 57 deletions(-) -- 2.7.4

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[PATCH net-next v2 0/2] add benchmark selftest and optimization for ptr_ring
by Yunsheng Lin 28 Jun '21

28 Jun '21

Patch 1: add a selftest app to benchmark the performance of ptr_ring. Patch 2: make __ptr_ring_empty() checking more reliable and use the just added selftest to benchmark the performance impact. V2: add patch 1 and add performance data for patch 2. Yunsheng Lin (2): selftests/ptr_ring: add benchmark application for ptr_ring ptr_ring: make __ptr_ring_empty() checking more reliable MAINTAINERS | 5 + include/linux/ptr_ring.h | 25 ++- tools/testing/selftests/ptr_ring/Makefile | 6 + tools/testing/selftests/ptr_ring/ptr_ring_test.c | 249 +++++++++++++++++++++++ tools/testing/selftests/ptr_ring/ptr_ring_test.h | 150 ++++++++++++++ 5 files changed, 426 insertions(+), 9 deletions(-) create mode 100644 tools/testing/selftests/ptr_ring/Makefile create mode 100644 tools/testing/selftests/ptr_ring/ptr_ring_test.c create mode 100644 tools/testing/selftests/ptr_ring/ptr_ring_test.h -- 2.7.4

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[PATCH net] net: hns3: Fixes+Refactors the broken set channel error fallback logic
by Salil Mehta 25 Jun '21

25 Jun '21

The fallback logic of the set channels when set_channel() fails to configure TX Sched/RSS H/W configuration or for the code which brings down/restores client before/therafter is not handled properly. Fix and refactor the code for handling the errors properly and to improve the readibility. Fixes: 3a5a5f06d4d2 ("net: hns3: revert to old channel when setting new channel num fail") Signed-off-by: Salil Mehta <salil.mehta(a)huawei.com> Signed-off-by: Peng Li <lipeng321(a)huawei.com> --- .../net/ethernet/hisilicon/hns3/hns3_enet.c | 77 +++++++++++-------- 1 file changed, 47 insertions(+), 30 deletions(-) diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c index bf4302a5cf95..fbb0f4c9b98e 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c @@ -4692,24 +4692,60 @@ static int hns3_reset_notify(struct hnae3_handle *handle, static int hns3_change_channels(struct hnae3_handle *handle, u32 new_tqp_num, bool rxfh_configured) { - int ret; + const struct hnae3_ae_ops *ops = handle->ae_algo->ops; + u32 org_tqp_num = handle->kinfo.num_tqps; + struct device *dev = &handle->pdev->dev; + u32 req_tqp_num = new_tqp_num; + bool revert_old_config = false; + int ret, retval = 0; + + /* bring down the client */ + ret = hns3_reset_notify(handle, HNAE3_DOWN_CLIENT); + if (ret) { + dev_err(dev, "client down fail, this should'nt have happened!\n"); + return ret; + } - ret = handle->ae_algo->ops->set_channels(handle, new_tqp_num, - rxfh_configured); + ret = hns3_reset_notify(handle, HNAE3_UNINIT_CLIENT); if (ret) { - dev_err(&handle->pdev->dev, - "Change tqp num(%u) fail.\n", new_tqp_num); + dev_err(dev, "client uninit fail, this should'nt have happened!\n"); return ret; } +revert_old_tpqs_config: + /* update the TX Sched and RSS config in the H/W */ + ret = ops->set_channels(handle, req_tqp_num, rxfh_configured); + if (ret) { + dev_err(dev, "TX Sched/RSS H/W cfg fail(=%d) for %s TPQs\n", + ret, revert_old_config ? "old" : "new"); + goto err_set_channel; + } + + /* restore the client */ ret = hns3_reset_notify(handle, HNAE3_INIT_CLIENT); - if (ret) - return ret; + if (ret) { + dev_err(dev, "failed to initialize the client again\n"); + goto err_set_channel; + } ret = hns3_reset_notify(handle, HNAE3_UP_CLIENT); - if (ret) - hns3_reset_notify(handle, HNAE3_UNINIT_CLIENT); + if (ret) { + dev_err(dev, "Client up fail, this should'nt have happened!\n"); + return ret; + } + + return retval; +err_set_channel: + if (!revert_old_config) { + dev_warn(dev, "Revert TX Sched/RSS H/W config with old TPQs\n"); + req_tqp_num = org_tqp_num; + revert_old_config = true; + retval = ret; + goto revert_old_tpqs_config; + } + dev_err(dev, "Bad, we could'nt revert to old TPQ H/W config\n"); + dev_warn(dev, "Device maybe insane. Reload driver/Reset required!\n"); return ret; } @@ -4720,7 +4756,6 @@ int hns3_set_channels(struct net_device *netdev, struct hnae3_knic_private_info *kinfo = &h->kinfo; bool rxfh_configured = netif_is_rxfh_configured(netdev); u32 new_tqp_num = ch->combined_count; - u16 org_tqp_num; int ret; if (hns3_nic_resetting(netdev)) @@ -4750,28 +4785,10 @@ int hns3_set_channels(struct net_device *netdev, "set channels: tqp_num=%u, rxfh=%d\n", new_tqp_num, rxfh_configured); - ret = hns3_reset_notify(h, HNAE3_DOWN_CLIENT); - if (ret) - return ret; - - ret = hns3_reset_notify(h, HNAE3_UNINIT_CLIENT); - if (ret) - return ret; - - org_tqp_num = h->kinfo.num_tqps; ret = hns3_change_channels(h, new_tqp_num, rxfh_configured); if (ret) { - int ret1; - - netdev_warn(netdev, - "Change channels fail, revert to old value\n"); - ret1 = hns3_change_channels(h, org_tqp_num, rxfh_configured); - if (ret1) { - netdev_err(netdev, - "revert to old channel fail\n"); - return ret1; - } - + netdev_err(netdev, "fail(=%d) to set number of channels to %u\n", ret, + new_tqp_num); return ret; } -- 2.17.1

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24 Jun '21

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[PATCH net-next v3 0/3] Some optimization for lockless qdisc
by Yunsheng Lin 24 Jun '21

24 Jun '21

Patch 1: remove unnecessary seqcount operation. Patch 2: implement TCQ_F_CAN_BYPASS. Patch 3: remove qdisc->empty. Performance data for pktgen in queue_xmit mode + dummy netdev with pfifo_fast: threads unpatched patched delta 1 2.60Mpps 3.21Mpps +23% 2 3.84Mpps 5.56Mpps +44% 4 5.52Mpps 5.58Mpps +1% 8 2.77Mpps 2.76Mpps -0.3% 16 2.24Mpps 2.23Mpps -0.4% Performance for IP forward testing: 1.05Mpps increases to 1.16Mpps, about 10% improvement. V3: Add 'Acked-by' from Jakub and 'Tested-by' from Vladimir, and resend based on latest net-next. V2: Adjust the comment and commit log according to discussion in V1. V1: Drop RFC tag, add nolock_qdisc_is_empty() and do the qdisc empty checking without the protection of qdisc->seqlock to aviod doing unnecessary spin_trylock() for contention case. RFC v4: Use STATE_MISSED and STATE_DRAINING to indicate non-empty qdisc, and add patch 1 and 3. Yunsheng Lin (3): net: sched: avoid unnecessary seqcount operation for lockless qdisc net: sched: implement TCQ_F_CAN_BYPASS for lockless qdisc net: sched: remove qdisc->empty for lockless qdisc include/net/sch_generic.h | 31 ++++++++++++++++++------------- net/core/dev.c | 27 +++++++++++++++++++++++++-- net/sched/sch_generic.c | 23 ++++++++++++++++------- 3 files changed, 59 insertions(+), 22 deletions(-) -- 2.7.4

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[PATCH V2 net-next 0/3] net: hns3: add support for TX push
by Yufeng Mo 22 Jun '21

22 Jun '21

This series adds TX push support for the HNS3 ethernet driver. V1 -> V2: 1. fix compile issue on non-arm64 system in patch #2 Huazhong Tan (2): net: hns3: add support for TX push mode net: hns3: add ethtool priv-flag for TX push Xiongfeng Wang (1): arm64: barrier: add DGH macros to control memory accesses merging arch/arm64/include/asm/assembler.h | 7 ++ arch/arm64/include/asm/barrier.h | 1 + drivers/net/ethernet/hisilicon/hns3/hnae3.h | 2 + drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 86 +++++++++++++++++++++- drivers/net/ethernet/hisilicon/hns3/hns3_enet.h | 6 ++ drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c | 21 +++++- .../net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c | 2 + .../ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 11 ++- .../ethernet/hisilicon/hns3/hns3pf/hclge_main.h | 8 ++ .../ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c | 2 + .../ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c | 11 ++- .../ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h | 8 ++ 12 files changed, 156 insertions(+), 9 deletions(-) -- 2.8.1

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[PATCH net v2] net: sched: add barrier to ensure correct ordering for lockless qdisc
by Yunsheng Lin 22 Jun '21

22 Jun '21

The spin_trylock() was assumed to contain the implicit barrier needed to ensure the correct ordering between STATE_MISSED setting/clearing and STATE_MISSED checking in commit a90c57f2cedd ("net: sched: fix packet stuck problem for lockless qdisc"). But it turns out that spin_trylock() only has load-acquire semantic, for strongly-ordered system(like x86), the compiler barrier implicitly contained in spin_trylock() seems enough to ensure the correct ordering. But for weakly-orderly system (like arm64), the store-release semantic is needed to ensure the correct ordering as clear_bit() and test_bit() is store operation, see queued_spin_lock(). So add the explicit barrier to ensure the correct ordering for the above case. Fixes: a90c57f2cedd ("net: sched: fix packet stuck problem for lockless qdisc") Signed-off-by: Yunsheng Lin <linyunsheng(a)huawei.com> --- V2: add the missing Fixes tag. The above ordering issue can easily cause out of order packet problem when testing lockless qdisc bypass patchset [1] with two iperf threads and one netdev queue in arm64 system. 1. https://lkml.org/lkml/2021/6/2/1417 --- include/net/sch_generic.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index 1e62551..5771030 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -163,6 +163,12 @@ static inline bool qdisc_run_begin(struct Qdisc *qdisc) if (spin_trylock(&qdisc->seqlock)) goto nolock_empty; + /* Paired with smp_mb__after_atomic() to make sure + * STATE_MISSED checking is synchronized with clearing + * in pfifo_fast_dequeue(). + */ + smp_mb__before_atomic(); + /* If the MISSED flag is set, it means other thread has * set the MISSED flag before second spin_trylock(), so * we can return false here to avoid multi cpus doing @@ -180,6 +186,12 @@ static inline bool qdisc_run_begin(struct Qdisc *qdisc) */ set_bit(__QDISC_STATE_MISSED, &qdisc->state); + /* spin_trylock() only has load-acquire semantic, so use + * smp_mb__after_atomic() to ensure STATE_MISSED is set + * before doing the second spin_trylock(). + */ + smp_mb__after_atomic(); + /* Retry again in case other CPU may not see the new flag * after it releases the lock at the end of qdisc_run_end(). */ -- 2.7.4

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[PATCH net-next 0/3] net: hns3: add support for TX push
by Yufeng Mo 21 Jun '21

21 Jun '21

This series adds TX push support for the HNS3 ethernet driver. Huazhong Tan (2): net: hns3: add support for TX push mode net: hns3: add ethtool priv-flag for TX push Xiongfeng Wang (1): arm64: barrier: Add DGH macros to control memory accesses merging arch/arm64/include/asm/assembler.h | 7 ++ arch/arm64/include/asm/barrier.h | 1 + drivers/net/ethernet/hisilicon/hns3/hnae3.h | 2 + drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 82 ++++++++++++++++++++-- drivers/net/ethernet/hisilicon/hns3/hns3_enet.h | 6 ++ drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c | 21 +++++- .../net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c | 2 + .../ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 11 ++- .../ethernet/hisilicon/hns3/hns3pf/hclge_main.h | 8 +++ .../ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c | 2 + .../ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c | 11 ++- .../ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h | 8 +++ 12 files changed, 152 insertions(+), 9 deletions(-) -- 2.8.1

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